77808 is a nice example. After the last move they just hang and wont end the turn. This game will stay in queue for a week or so and victory will never be assigned.
#79845 is another example. The log shows that Digital's turn ended, but mine never is not initiated. :'(
The other day Cragalanche and I were trying to set up a cooperative game against AIs. The game froze on his side, but not on mine! Leaving the game, trying to drop or surrender wouldn't unfreeze it.
So we abandoned the game, started a new one, and this time it was my turn to get frozen, while the game still ran on his side!
Chat was still functional, that's how we discovered this. Unfortunately i didn't record game numbers before they dropped off my game list.
CONCLUSION: what we experience as "game freeze" is (at least sometimes) not the game itself getting stuck, but a player not being able to interact with the game any longer. Hopefully this will help investigations.